18956946460 has 72 divisors (see below), whose sum is σ = 41139584640. Its totient is φ = 7336925568.

The previous prime is 18956946457. The next prime is 18956946467. The reversal of 18956946460 is 6464965981.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18956946395 and 18956946404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18956946467) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4028469 + ... + 4033171.

It is an arithmetic number, because the mean of its divisors is an integer number (571383120).

Almost surely, 2^18956946460 is an apocalyptic number.

18956946460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18956946460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20569792320).

18956946460 is an abundant number, since it is smaller than the sum of its proper divisors (22182638180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18956946460 is a wasteful number, since it uses less digits than its factorization.

18956946460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4907 (or 4862 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 58.

The spelling of 18956946460 in words is "eighteen billion, nine hundred fifty-six million, nine hundred forty-six thousand, four hundred sixty".